Datasheet
Theory of operation STPMC1
46/77 Doc ID 15728 Rev 7
i
CT
= α i
N
+ α i
S
+ β i
R
i
CN
= α i
T
+ β i
S
+ γ i
R
9.17 Data records map
There are seven groups of four data records available, each consisting of a parity nibble
(see paragraph
9.17.8
) and 28-bit data field.
The data records have fixed position of reading. This means that no addressing of records is
necessary. It is up to an application to decide how many records should read out from the
device. If an application sends to device a precharge command (see paragraph
9.20
) before
the reading of a group, the internal group pointer is incremented. This way, a faster access
to later groups is possible. Below are shown all the groups, their position within the
sequence of reading, and the name and assembly of data records.
9.17.1 Group 0 data records
0.1 DAP:
● 3- phase active energy wide band: 20-bit accumulator of 3-ph active energy wide band
(see paragraph
9.11
)
● 3-ph lower status: bits [0:7] of 3-phase status (see
Tabl e 3 1
)
0.2 DRP:
● 3- phase reactive energy: 20-bit accumulator of 3-ph reactive energy (see paragraph
9.11
)
● 3-ph up status: bits [8:11] of 3-phase status (see
Tabl e 3 1
)
● TSG bits: 4 TSG mode signal (see paragraph
9.20
)
0.3 DFP:
● 3-phase active energy fundamental: 20-bit accumulator of 3-ph active energy from
fundamental harmonic (see paragraph
9.11
)
● system signals: commands BANK-PUMP-TST0-TST1-TST2-RD-WE-precharge (see
paragraph
9.20
)
Figure 14. Group 0 data records
parity 3-phase active energy wide band 3-ph lower status
DAP
DRP
DFP
PRD
parity DC uNperiod
parity 3-phase active energy fundamental system signals
12 bit
4 bit 16 bit
4 bit4 bit
20 bit
8 bit
parity TSG bits3-phase reactive energy 3-ph up status
parity 3-phase active energy wide band 3-ph lower status
DAP
DRP
DFP
PRD
parity DC uNperiod
parity 3-phase active energy fundamental system signals
12 bit
4 bit4 bit 16 bit
4 bit4 bit
20 bit
8 bit
parity TSG bits3-phase reactive energy 3-ph up status
parity 3-phase active energy wide band 3-ph lower status
DAP
DRP
DFP
PRD
parity DC uNperiod
parity 3-phase active energy fundamental system signals
12 bit
4 bit 16 bit
4 bit4 bit
20 bit
8 bit
parity TSG bits3-phase reactive energy 3-ph up status
parity 3-phase active energy wide band 3-ph lower status
DAP
DRP
DFP
PRD
parity DC uNperiod
parity 3-phase active energy fundamental system signals
12 bit
4 bit4 bit 16 bit
4 bit4 bit
20 bit
8 bit
parity TSG bits3-phase reactive energy 3-ph up status